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FAN5361 Datasheet PDF : 17 Pages
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September 2008
FAN5361
6MHz, 600mA TinyBuck™ Synchronous Buck Regulator
Features
6MHz Fixed-Frequency Operation
35µA Typical Quiescent Current
Best-in-Class Load Transient
600mA Output Current Capability
2.3V to 5.5V Input Voltage Range
1.0 to 1.82V Fixed Output Voltage
Low Ripple Light-Load PFM Mode
Forced PWM and External Clock Synchronization
Internal Soft-Start
Input Under-Voltage Lockout (UVLO)
Thermal Shutdown and Overload Protection
6-bump WLCSP, 0.4mm Pitch
6-pin 2 x 2mm UMLP
Applications
Cell Phones
Portable Media Players
WLAN, 3G, and 4G Data Cards
Description
The FAN5361 is a 600mA, step-down, switching voltage
regulator that delivers a fixed output from an input voltage
supply of 2.3V to 5.5V. Using a proprietary architecture with
synchronous rectification, the FAN5361 is capable of
delivering a peak efficiency of 92%, while maintaining
efficiency over 80% at load currents as low as 1mA.
The regulator operates at a nominal fixed frequency of 6MHz,
which reduces the value of the external components to 470nH
for the output inductor and 4.7µF for the output capacitor. The
PWM modulator can be synchronized to an external frequency
source.
At moderate and light loads, pulse frequency modulation is
used to operate the device in power-save mode with a typical
quiescent current of 35µA. Even with such a low quiescent
current, the part exhibits excellent transient response during
large load swings. At higher loads, the system automatically
switches to fixed-frequency control, operating at 6MHz. In
shutdown mode, the supply current drops below 1µA,
reducing power consumption. For applications that require
minimum ripple or fixed frequency, PFM mode can be
disabled using the MODE pin.
The FAN5361 is available in 6-bump, 0.4mm pitch, Wafer-
Level Chip-Scale Package (WLCSP) and a 6-lead 2 x 2mm
ultra-thin MLP package.
Typical Applications
4.7 F
MODE A1
L1 SW B1
470nH
FB C1
COUT
A2 VIN
B2 EN
C2 GND
CIN
2.2 F
Figure 1. Typical Applications
© 2008 Fairchild Semiconductor Corporation
FAN5361 • Rev. 1.0.0
www.fairchildsemi.com
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